+ {
+ int new_fd = dup (fd);
+ ASSERT (0 <= new_fd);
+ ASSERT (close (fd) == 0);
+ ASSERT (dup2 (new_fd, fd) == fd);
+ ASSERT (close (new_fd) == 0);
+ ASSERT (dup_cloexec (fd) == new_fd);
+ ASSERT (dup2 (new_fd, fd) == fd);
+ ASSERT (close (new_fd) == 0);
+ ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, new_fd) == new_fd);
+ ASSERT (close (fd) == 0);
+ ASSERT (fcntl (new_fd, F_DUPFD, fd) == fd);
+ ASSERT (close (new_fd) == 0);
+#if GNULIB_TEST_DUP3
+ ASSERT (dup3 (fd, new_fd, 0) == new_fd);
+ ASSERT (dup3 (new_fd, fd, 0) == fd);
+ ASSERT (close (new_fd) == 0);
+#endif
+ }